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Jung, Jinsang,Kim, Young J.,Aggarwal, Shankar Gopala,Kawamura, Kimitaka Elsevier 2011 Atmospheric environment Vol.45 No.16
<P><B>Abstract</B></P><P>The hygroscopic properties of the water-soluble matter extracts of atmospheric aerosols collected at an urban site (47.92° N, 106.90° E, ∼1300m above sea level) in Ulaanbaatar, Mongolia during the cold winter of 2007 were investigated using a hygroscopicity tandem differential mobility analyzer (H-TDMA). Dynamic shape correction factor (<I>χ</I>), the ratio of the actual drag force on a non-spherical aerosol particle to that on a sphere of equivalent volume, of the laboratory generated water-soluble matter (WSM) was found to be 1.09–1.38 (avg. 1.23±0.10), implying that particles generated from the WSM are highly non-spherical. The reduction in the mobility diameter can cause ∼11% underestimation in a hygroscopic growth factor at 85% RH. The hygroscopic growth factors at 85% RH (<I>g</I>(85%)), defined as the ratio of the particle diameter at 85% RH to that at RH<10% (initial dry diameter), of the WSM (initial dry particle diameter=100nm) were 1.32–1.50 (avg. 1.40±0.06). The <I>g</I>(RH) of the water-soluble organic matter (WSOM) was retrieved from the measured <I>g</I>(RH) of the WSM and using the ZSR (Zdanovskii–Stokes–Robinson) approach and the thermodynamic aerosol inorganic model (AIM). We found that the <I>g</I>(85%) of the WSOM were in the range of 1.11–1.35 (avg. 1.22±0.08), which are comparable to those of the biomass burning aerosols.</P> <P><B>Graphical abstract</B></P><P><ce:figure id='dfig1'></ce:figure></P><P><B>Highlights</B></P><P>► Mobility diameter shows substantial reduction at 20–40% RH. ► Laboratory generated particles are highly non-spherical shape. ► Hygroscopic growth factor of water-soluble organic aerosols is 1.22±0.08 at 85% RH. ► These growth factors are comparable to biomass burning aerosol and aged organics.</P>